The father of architecture.
Marcus Vitruvius Pollio was a Roman architect and engineer during the 1st century BC, known for his multi-volume (ten) work entitled De architectura. He had a great influence on the great masters of the Renaissance.
Vitruvius defined the proportions of Vitruvian Man, as he was later drawn by Leonardo da Vinci: the human body inscribed in a circle and square (fundamental geometric patterns of the cosmic order).